JPH0272084A - Water tank - Google Patents

Abstract

PURPOSE:To permit an efficient water feed into a main and auxiliary tank and an easy inspection and maintenance of a water tank by providing a secondary water feed pipe of a small diameter, a main water feed pipe of a larger diameter passing through an auxiliary tank and a main valve outside the auxiliary tank for opening and closing the main water feed pipe by a low water level adjusting device. CONSTITUTION:When the water level in a main tank 1 is not higher than a predetermined low water level A, an auxiliary valve 8b actuates a main valve 8a to open to feed water into the tank through a main water feed pipe 7, which, provided with a large diameter to permit a large amount of water to be fed per unit time, is capable of filling the main tank 1 with water in a short time. When the water level reaches the predetermined low water level A, the main valve 8 is closed to discontinue water feed from the main water feed pipe 7. When the water level in an auxiliary tank 3 is higher than the predetermined low water level A and is not higher than a predetermined high water level, a secondary predetermined low water level valve 11 is opened to feed water from a secondary water feed pipe 10, which, provided with a small diameter, feeds the small portions of water. When the water level in the auxiliary tank 3 reaches the predetermined high water level, the secondary predetermined low water level valve 11 is closed to discontinue water feed from the secondary water feed pipe 10.

Description

[Detailed description of the invention] purpose of invention (Industrial application field) The present invention relates to a water storage tank.

(Prior Art) Conventionally, tanks made of iron or synthetic resin have been used as water storage tanks. However, from the viewpoint of hygiene, fire resistance, and earthquake resistance, stainless steel tanks are increasingly being used these days. However, when tap water is supplied into a water storage tank, the sterilizing chlorine contained in the water is liberated and gasified as the water is released, and the chlorine gas flows into the space above the water level in the tank. Float. On the other hand, dew condensation occurs due to the temperature difference between the inside and outside of the space inside the tank, so that the chlorine gas is easily dissolved in the water droplets.

Then, as the outside temperature rises, the water droplets evaporate, and as water is deformed and released, chlorine gas is continuously dissolved in the water droplets, and the chlorine in the water droplets is gradually concentrated. As a result, the water droplets exhibit an oxidizing effect and corrode the water storage tank even though it is made of stainless steel.

In particular, in recent years, as the water quality of tap water has deteriorated, the amount of dissolved chlorine for sterilization has increased, so such corrosion has become even more noticeable.

Therefore, in order to prevent corrosion of the tank body itself, it has been proposed that, for example, an auxiliary tank is provided above the tank body, and each tank is provided with a water supply pipe and a water level adjustment device (in practice). Publication No. 56-17583).

In this water storage tank, water is first supplied from a water supply pipe connected to the tank body. When the water level in the tank body reaches a predetermined water level, a water level adjustment device provided in the tank body is activated to stop the water supply. Subsequently, water is supplied from a water supply pipe connected to the auxiliary tank to fill the tank body, and then water is supplied to the auxiliary tank. Then, when the water level in the auxiliary tank reaches a predetermined water level, the water level adjustment device is activated and water supply from the water supply pipe is stopped.

(Problems to be Solved by the Invention) However, in the conventional water storage tank, the water supply pipes connected to the tank body and the auxiliary tank are formed to have approximately the same diameter. In this case, if the rainwater supply pipe is made large in diameter, the amount of water supplied per unit time will increase, and water can be supplied to the tank body in a short time, but water cannot be supplied to the auxiliary tank, which is smaller than the tank body, at a specified time. It is difficult to maintain the water level. Furthermore, if the rainwater supply pipe is made small in diameter, the amount of water supplied per unit time will be reduced, and although it becomes easier to supply water into the auxiliary tank, there is a problem in that it takes time to supply water into the tank body.

In addition, since the conventional water storage tank has a structure in which the tank main body and the auxiliary tank are each provided with a water supply pipe and a water level adjustment device, each water supply pipe and each water level adjustment device in the tank main body and the auxiliary tank are provided. and are far apart from each other, making it difficult to maintain and inspect them.

Furthermore, since the outlet of the water supply pipe connected to the tank body is always located within the stored water, there is a risk that the water in the tank will flow back into the water supply pipe due to a siphon effect, so measures are required to prevent this backflow. There was a problem in that it had to be provided separately.

Structure of the Invention (Means for Solving the Problems) The present invention has been made to solve the above problems, and the water storage tank of the first invention has a smaller auxiliary support attached to the upper part of the tank body. A tank is formed so as to communicate with the inside of the tank body, and a sub-water supply pipe is introduced into the auxiliary tank, and water supply to the sub-water pipe is stopped when the water level in the auxiliary tank reaches the upper fixed water level. In addition to installing an upper water level adjustment device that supplies water when the water level is below that level, a main water supply pipe is introduced into the auxiliary tank, and water supply to the main water pipe is stopped when the water level reaches the lower constant water level. In a water storage tank equipped with a lower water level adjustment device that supplies water when the water is below that level, the auxiliary water supply pipe is made small in diameter so that the amount of water supplied per unit time is small, and the main water supply pipe is introduced from a part of the auxiliary tank. The gist of the water storage tank is a large diameter water tank that can supply a large amount of water per unit time, and a main valve that opens and closes the main water pipe by the lower water level adjustment device is provided outside the auxiliary tank.

In addition to the configuration of the first invention, the second invention also provides a main water supply pipe introduced into the auxiliary tank that leads to the tank main body side, and a main water supply pipe inside the auxiliary tank that is connected to the inside of the main water supply pipe. It communicates with the space above the upper constant water level of the auxiliary tank,
The gist of this is a water storage tank that is equipped with a siphon-breaking communication part to prevent the water in the tank from flowing back into the main water supply pipe due to the siphon phenomenon.

(Function) By exploring the above configuration, in the first invention, when the water level in the water storage tank is below the lower constant water level, the lower water level adjustment device is activated, the main valve is opened, and water is not supplied from the main water pipe. It will be done. At this time, since the main water supply pipe is formed in a large diameter shape that can supply a large amount of water per unit time, it is possible to fill the tank body in a short time. When the water level reaches the lower constant water level, the lower water level adjusting device is activated, the main valve is closed, and water supply from the main water pipe is stopped.

Further, when the water level in the auxiliary tank is higher than the lower constant water level and below the upper constant water level, the upper water level adjustment device is activated and water is supplied from the auxiliary water supply pipe.

At this time, since the auxiliary water supply pipe is formed in a small diameter shape that supplies a small amount of water per unit time, it is possible to efficiently supply water up to the upper constant water level in the auxiliary tank. Then, when the water level reaches the upper constant water level, the upper water level adjustment device is activated and water supply from the sub-water pipe is stopped.

By the way, the main water supply pipe, the lower water level adjustment device, the auxiliary water supply pipe, and the upper water level adjustment device are all provided in the auxiliary tank, and the main valve for opening and closing the main water supply pipe is provided outside the auxiliary tank. Therefore, these maintenance and inspections can be performed easily.

In addition, in the second invention, the main water supply pipe in the auxiliary tank,
Since a siphon-breaking communication part is provided that communicates the inside of this tank with the space above the upper constant water level of the auxiliary tank, in addition to the effect of the first invention, the water in the tank flows back inside the main water supply pipe due to the siphon phenomenon. It is prevented from doing so.

(Example) An example embodying the present invention will be described below with reference to the drawings.

The top plate 2 of the tank body 1 in which water is stored has an slanted outer and inner surface so that the center is higher upwards, and an auxiliary tank 3 smaller than the tank body 1 is provided at the center. It is being The lower part of this auxiliary tank 3 communicates with the inside of the tank body 1.

The upper plate 4 of the auxiliary tank 3 is provided with a vent pipe 5 opening to the outside and a manhole 6 having a manhole 116a. Further, a main water supply pipe 7 for supplying water to the inside of the tank body 1 is connected to one side plate of the auxiliary tank 3. This main water supply pipe 7 is formed in a large diameter shape that can supply a large amount of water per unit time. The main water supply pipe 7 is introduced into the auxiliary tank 3, extends in parallel with the upper plate 4 of the auxiliary tank 3 to near the opposite side plate, and is bent downward,
The lower end opening is led below the lower constant water level A, which is the lower limit water level in the tank body 1.

Furthermore, in the bent portion of the main water supply pipe 7 in the auxiliary tank 3, a plurality of through holes 7a are provided as siphon breaking communication portions in a portion corresponding to the inner surface of the auxiliary tank 3. Therefore, through these through holes 7a, the inside of the main water supply pipe 7 and the space above the upper constant water level, which is the upper limit water level of the auxiliary tank 3, are communicated with each other. If the water flows backwards in the water supply pipe 7,
It is possible to discharge the water that has flowed back through the through hole 7a. Further, when water is supplied from the main water supply pipe 7, the water pressure can cause water to be ejected from the through hole 7a onto the inner surface of the auxiliary tank 3. An overflow pipe 12 is connected to a side plate of the auxiliary tank 3 that faces the side plate to which the main water supply pipe 7 is connected.

The main water supply pipe 7 is provided with a main positioning water level valve 8 as a lower water level adjusting device. The main fixed water level valve 8 includes a main valve 8a installed in the main water supply pipe 7 outside the auxiliary tank 3, a bypass pipe 9 extending from the main valve 8a and introduced into the auxiliary tank 3 from above, and It consists of a child valve 8b provided at the discharge port at the inner end of the bypass pipe 9, and a ball tap 8C attached to the child valve 8b. The bypass pipe 9
The discharge port is located above the upper constant water level.

When the water level in the tank body 1 is lower than the lower constant water level A, the ball tap 8C opens the child valve 8b and the main valve 8a to supply water from the bypass pipe 9 and the main water supply pipe 7. There is. Further, when the water level reaches the lower constant water level A, the ball tap 8C closes the child valve 8b to stop water supply from the bypass pipe 9, and also closes the small valve 8b.
Based on this operation, the main valve 8a is closed and water supply from the main water supply pipe 7 is stopped.

Further, in the main water supply pipe 7, at a position closer to the water source (on the right side in the figure) than the main valve 8a, there is a sub water supply pipe 10 formed in a small diameter shape that supplies less water per unit time than the main water supply pipe 7. is connected. This auxiliary water supply pipe 10 is introduced into the auxiliary tank 3 by detouring above the auxiliary tank 3, and its discharge port opens above the upper constant water level.

A sub-position water level valve 11 as an upper water level adjustment device is provided at the outlet of the sub-water supply pipe 10, and the sub-position water level valve 1
A ball tap lla is attached to 1. and,
The ball tap lla opens the sub-regular water level valve 11 to supply water from the auxiliary water supply pipe lO when the water level in the auxiliary tank 3 is below the upper fixed water level, and when the water level reaches the upper fixed water level, the sub-regular water level is The valve 11 is closed to stop water supply from the auxiliary water supply pipe 10.

Next, the operation and effect of this embodiment configured as described above will be explained.

When the water level in the tank body 1 is below the lower constant water level A,
The main valve 8a is opened based on the operation of the child valve 8b, and water is supplied from the main water supply pipe 7. Since this main water supply pipe 7 is formed in a large diameter shape that can supply a large amount of water per unit time, it is possible to fill the tank body 1 with water in a short time. Note that the main water supply pipe 7 in the auxiliary tank 3 has a plurality of through holes 7a.
is provided, so that when water is supplied from the main water supply pipe 7, water is ejected from the through hole 7a against the inner surface of the auxiliary tank 3 due to the water pressure. Therefore, the inner surface of the auxiliary tank 3 is cleaned by this jet of water and corrosion is prevented. When the water level reaches the lower constant water level A, the main valve 8a is closed and water supply from the main water pipe 7 is stopped.

When the water level in the auxiliary tank 3 is higher than the lower constant water level A and below the upper constant water level, the auxiliary constant water level valve 11 is opened and water is supplied from the auxiliary water supply pipe 10.

Since the auxiliary water supply pipe 10 is formed to have a smaller diameter so that the amount of water supplied per unit time is smaller than that of the main water supply pipe 7, water is supplied little by little. When the water level in the auxiliary tank 3 reaches the upper constant water level, the sub-static water level valve 11 is closed and water supply from the sub-water supply pipe 10 is stopped.

By the way, in this embodiment, the main water supply pipe 7 is immersed in the water stored in the tank body 1, so when the water supply is stopped, the stored water flows back through the main water pipe 7 due to the siphon phenomenon. However, at the bent part of the main water supply pipe 7 inside the auxiliary tank 3,
Since a plurality of through holes 7a are provided that communicate the inside of the main water supply pipe 7 and the space above the upper constant water level of the auxiliary tank 3, the water that has flowed back flows from these through holes 7a to that space. is discharged to. In addition, since the outlet of the auxiliary water supply pipe lO and the bypass pipe 9 has a structure that does not submerge under the water surface,
No backflow occurs in these.

Therefore, in this embodiment, there is no need to provide a backflow prevention device such as a backflow prevention valve or a vacuum breaker, unlike in the conventional case.

In addition, in the water storage tank of this embodiment, the main water supply pipe 7,
The auxiliary water supply pipe 10, the main fixed water level valve 8, and the auxiliary fixed water level valve 11 are provided centrally in the auxiliary tank 3, and the main valve 8a for opening and closing the main water supply pipe 7 is located outside of the auxiliary tank 3. Since these parts are provided in close proximity to each other, maintenance and inspection becomes easy.

Furthermore, when the main positioning water level valve 8 is used alone, the slave valve 8
Since there is a delay of several seconds to several tens of seconds after the main valve 8a closes, an overflow may occur. Therefore, in order to avoid the above-mentioned overflow, it is necessary to use a large auxiliary tank in consideration of the feces, but in this embodiment, it has a two-stage configuration of a main fixed water level valve 8 and a sub fixed water level valve 11. Therefore, the water level can be easily adjusted, and there is no need to worry about overflow, unlike in the past, and the auxiliary tank 3 can be small. Therefore, the number of members used per effective amount of water is reduced, making it possible to reduce costs.

In addition, if the top plate of a water storage tank is flat, air will accumulate in the tank body due to the condition of the foundation, welding distortion, etc., making this part prone to corrosion, but in this embodiment, the inner surface of the top plate 2 is Air is discharged to the outside from the ventilation pipe 5 via the auxiliary tank 3. Therefore, no air pockets are generated in the tank body 1, and corrosion of the top plate 2 of the tank body 1 is prevented.

In this embodiment, the outer surface of the top plate 2 is also formed in a slanted shape, so that when this water storage tank is installed outdoors, rainwater can quickly flow downward.

The present invention is not limited to the embodiments described above, and for example, by providing a ventilation fan to the auxiliary tank 3, the free gasified chlorine gas in the auxiliary tank 3 can be forcibly discharged to the outside of the auxiliary tank 3. You can. By doing so, the free gasified chlorine gas that has an adverse effect on the auxiliary tank 3 is quickly discharged to the outside, and further corrosion can be expected to be prevented. At this time, if the chlorine gas is led outdoors through piping or the like, corrosion of other equipment such as a machine room and a pump room arranged together with the water storage tank can be prevented.

Further, in the above embodiment, the main water supply pipe 7 was attached to the side plate of the auxiliary tank 3, but it may be attached to the upper plate 2 instead. Alternatively, it may be attached to the side plate.

Effects of the Invention As detailed above, according to the first invention, not only can water be efficiently supplied into the tank main body and the auxiliary tank, but also the main water supply pipe, the auxiliary water supply pipe, the upper water level adjustment device, and the lower part can be efficiently supplied with water. This has the effect that maintenance and inspection of the water level adjustment device can be easily performed.

Further, according to the second invention, in addition to the effects of the first invention, it is possible to prevent the water in the tank from flowing back into the main water supply pipe due to the siphon phenomenon, and there is an effect that there is no need to separately provide a backflow prevention means.

[Brief explanation of the drawing]

The figure is a sectional view of an embodiment embodying the present invention. Through-hole 7a as a water-break communication part, main positioning water level valve 8 as a lower water level adjustment device, main valve 8a, sub-water supply pipe 10
, sub-positioning water level valve 11° as an upper water level adjustment device

Claims (1)

[Claims] 1. A smaller auxiliary tank is formed in the upper part of the tank body so as to communicate with the inside of the tank body, and a sub-water supply pipe is introduced into the auxiliary tank, and the auxiliary water supply pipe is introduced into the auxiliary tank. The pipe is equipped with an upper water level adjustment device that stops water supply when the water level in the auxiliary tank reaches the upper fixed water level and resumes water supply when the water level is below that level. In a water storage tank where the main water supply pipe is equipped with a lower water level adjustment device that stops water supply when the water level reaches the lower fixed water level and resumes water supply when the water level is lower than that, the sub water supply pipe is connected to the water supply amount per unit time. The main water supply pipe is introduced from a part of the auxiliary tank and has a large diameter that allows for a large amount of water to be supplied per unit time, and the main valve opens and closes the main water supply pipe using the lower water level adjustment device. A water storage tank characterized in that a water storage tank is provided outside the auxiliary tank. 2. Form a smaller auxiliary tank on the top of the tank body so that it communicates with the inside of the tank body, introduce a sub-water supply pipe into the auxiliary tank, and connect the auxiliary water supply pipe to the auxiliary tank. In addition to installing an upper water level adjustment device that stops water supply when the water level reaches the upper fixed water level and resumes water supply when the water level is lower than that, a main water supply pipe is introduced into the auxiliary tank, and the water level is In a water storage tank equipped with a lower water level adjustment device that stops water supply when the lower water level reaches a fixed lower water level and resumes water supply when the water level is lower than that level, the sub water supply pipe has a small diameter shape that allows for a small amount of water to be supplied per unit time, The main water supply pipe is made to have a large diameter that can supply a large amount of water per unit time, and a main valve that opens and closes the main water supply pipe by the lower water level adjustment device is provided outside the auxiliary tank, and a main valve introduced into the auxiliary tank is installed. In addition to leading the water supply pipe to the tank main body side, the main water supply pipe in the auxiliary tank communicates the inside of the main water supply pipe with the space above the upper constant water level of the auxiliary tank, and the water in the tank is prevented by a siphon phenomenon. A water storage tank characterized by being provided with a siphon-breaking communication part to prevent water from flowing backward in a main water supply pipe. 3. The water storage tank according to claim 2, wherein the siphon breaking communication portion is a plurality of through holes. 4. The main water supply pipe is introduced from the side of the auxiliary tank, extends parallel to the top plate of the auxiliary tank to near the opposite side, is bent downward, and is led below the constant water level of the lower part of the tank body. The water storage tank described in Section 3.